C++: Add close calls to examples for cpp/toctou-race-condition.

Author: geoffw0

cpp/ql/src/Security/CWE/CWE-367/TOCTOUFilesystemRaceBad.c

@@ -1,15 +1,17 @@
 char *file_name;
 FILE *f_ptr;
- 
+
 /* Initialize file_name */
- 
+
 f_ptr = fopen(file_name, "w");
 if (f_ptr == NULL)  {
   /* Handle error */
 }
- 
+
 /* ... */
- 
+
 if (chmod(file_name, S_IRUSR) == -1) {
   /* Handle error */
-}
+}
+
+fclose(f_ptr);

cpp/ql/src/Security/CWE/CWE-367/TOCTOUFilesystemRaceGood.c

@@ -1,8 +1,8 @@
 char *file_name;
 int fd;
- 
+
 /* Initialize file_name */
- 
+
 fd = open(
   file_name,
   O_WRONLY | O_CREAT | O_EXCL,
@@ -11,9 +11,11 @@ fd = open(
 if (fd == -1) {
   /* Handle error */
 }
- 
+
 /* ... */
- 
+
 if (fchmod(fd, S_IRUSR) == -1) {
   /* Handle error */
-}
+}
+
+close(fd);